package cn.shutdown.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Map;
import java.util.TreeMap;

public class Md5Util {

	/**
	 * 
	 * @param plainText
	 *            明文
	 * @return 32位密文
	 */
	public static String encryption(String plainText) {
		String re_md5 = new String();
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			try {
				md.update(plainText.getBytes("utf-8"));
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			byte b[] = md.digest();

			int i;

			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}

			re_md5 = buf.toString();

		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return re_md5;
	}
	
	public static String encryptionUpperCase(String plainText){
		return encryption(plainText).toUpperCase();
	}

	public static void main(String[] args) {
		System.out.println(encryption("123456").toUpperCase());
	}

}
